Plasterer&#39;s mitering plane



Jan. 12,1926; 1,569,768

J. MCNAMARA, JR

PLASTERERS MITERING PLANE Filed Jan. 28. 1924 Vom/EX Patented Jan. 12,1926.

' UNITED STATES JAMES MQNAMARA, JR.,

oF PORTLAND; OREGON'.

PLASTERERS MITERING- PLANE.

Application led January 28, 1924. Serial No. 689,123.

To ZZ whom lamong cof/merry:

Be it hereby known that I, JAMES MC- NAMAKA, Jr., a citizen of theUnited States, and a resident of Portland, in the county of Multnomahand State of Oregon, have invented a new and useful Plasterers vMiteringPlane, of which the following is a specification.

rl`his invention relates generally to the plastering art, and moreparticularly to the construction of miter corners in mouldings made ofplaster.

T he object of my invention is to provide an exceedingly simple andefficient mitering planeT which is in reality a four-sided plane forworking the concave and convex surfaces of a plaster moulding accuratelyto the eX treme corner of the miter.

Another object is the construction of a plane so that its cutting toolcan readily be sharpened and adjusted with the use of ordinary tools.

Still another object is the construction of the plane in a manner thatthe bit will cut on cit-her of two sides.

I accomplish these results in the manner set forth in the followingspecification and illustrated in the accompanying drawing, in whichFigure 1 is a side elevation of the plane with its mid-section brokenaway to reduce its length. Figure 2 is a plan of Figure 1 with a portionbroken away along the line 2 2 in Fig. 1. Figure 3 is a left endelevation of Figure 1. Figure 4 is a right end elevation of Figure 1.Figure 5 is a portional side elevation of a modified form of the deviceof which Figure 6 is a left end elevation. Figure T is a portional sideelevation of still another modification of the device, of which Figure 8is a left end elevation.

Similar numbers of reference refer to the same parts throughout theseveral views.

Referring in detail to the drawing, I have constructed my device in theform of a parallelogram having two long sides 10 and 11. The side 10 isflat and the side 11 is rounded, while the short sides 12 and 13 areflat and forni acute angles with the sides 10 and 11,.

in which are placed the large fillets 14 which are grooved along thecenter lines of the acute angles, above referred to, on both sides ofthe fillets 14 to receive the slotted bits 15 and 1G. Screws 1T arethreaded into the fillets 14 and provide adjustment for the bits land16. J

The faces 18 of the bits 15 and 16 project slightly beyond the face ofthe plane to give the required set. Cross braces 19 add stiffness to thelong sides 10 and 11, andv at the same time provide better grips for thehands.

In Figures 5 and 6 I have illustrated a bit 20 which is provided with adovetail 21 with adjusting screw 22. In Figures 7 and 8 the blade 23 ismade double handed and provided with countersunk holes for the stovebolts 24.

rlhe sides 10 and 11 are made somewhat heavier near the points in thetwo modifications, just described, to permit the reception of theblades. It is preferable to slot the holes for the stove bolts 24 in theside 10 to permit of adjustment for the bit 23. If de sired a smallpiece of paper or other material may be used to till the gap between theblade and the shoulder on the side 10.

The operation of my device is as follows: The blades 15 are set withtheir cutting faces slightly projecting over the adjacent sides and theappropriate face 10, 11, 12 or 13 is placed against the moulding and thetwo moved baclwardly and forwardly until the point of the blade 15 hascut away the desired amount of material. This action tends to plane offthe high spots and inequalities right up to the corner of the miter.

The sizes of the plane, formations of the faces and n'iethods offastening and adjusting the bits can, of course, be varied greatlv tosuit the convenience or demand for a special tool without departing fromthe spirit of my invention. I

I am aware that planes have been constructed employing a blade on thenose of the plane and using only one face of the plane, I therefore donot claim my device broadly but intend to cover only such forms andmodifications as fall fairly within the appended claims:

1. A plasterers plane consisting of a quadrilateral frame having twoopposite long sides, one of which is rounded and the other Straight, andhaving two short'. sides forming acute angles at opposite corners ofsaid frame; and an adjustable bit placed across the edges of said acuteangles.

2. A plasterers plane consisting of a four a faced frame forming aparallelogram and hams er-peltei; @eaten angled l, Corners, FSM@ frameAhaving 'grooves cut. into f its sides through said corners, incombination with. Cutting blades litting.,intot said. grooves andvhaving the cutting edges'ofsaid blades eX- tending past the adjacentfacesaatthe aforesaid corners of said frame.

3. A plasterers planel-fconsisting of `a hollow four-sided frame in theform of an angled: parallelo'ganif 'whose short sides form acute ,anglesat opposite corners of saidifi'aine, one long side-of said frame havingafronnded face and thc other three sides having straight faces; and apair of cutting blades fadjustablyeecured along the center line of saidacute" angled corners.

4. A plasterers plane consisting of a hollowparallelogigaxnfshaped;frame hav-ing onel rounded andlonefstraighty'iside and having two short sides forming oblique angles tosaid long'sidgegaid,iranies having large fillets forined'in each'of itspointed ends, and having, intermediate cross braces between said longsides, said fillets having grooves: formed` therein along the centerlines of their respective angles;l and cutting blades `lor saidgrooveseach of which consistsI of U-shaped; blade whose closed sharpcnededge projects somewhat pastl the point of interseetion' of the adjacentsides of said traine and'ascijew yin said v'fillet adapted to furnishadjnstme'ntfor sa'id'b'lade.

' JAMES MCNAMARA, JR`r

